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| mgedmin | ploufplouf, that error indicates a mismatch between Five and zope.configuration versions | 13:20 |
|---|---|---|
| ploufplouf | yes thank you, y eventually get it | 13:20 |
| mgedmin | "y"? | 13:20 |
| ploufplouf | I | 13:21 |
| mgedmin | heh, ok | 13:21 |
| ploufplouf | I was trying to install zope with pip, and dependancies when absolutely not correct | 13:22 |
| mgedmin | have you found a solution? | 13:25 |
| mgedmin | (which would be downgrading zope.configuration to 3.8.1, probably) | 13:26 |
| ploufplouf | yes it's ok now | 13:30 |
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| elon | How does the Zope ORM, ZODB, manage memory? Suppose I want to store and/or load an instance of class A, that contains an instance of class B, and another instance of class A, which contains an instance of class A and one of class B(about a hundred layers deep, for example). If I load the top-object, will all the sub-objects be loaded into memory, or only as they are needed(lazy)? | 18:15 |
| betabug | elon: first of all, ZODB is *not* an ORM | 18:17 |
| betabug | second, things are loaded into memory only as needed | 18:17 |
| betabug | a certain amount of objects are cached in memory (you can adjust the size of that cache) | 18:18 |
| elon | betabug: Sorry for that, I've been working with SQLAlchemy all day. I know that it isn't since it doesn't map objects in a relational database | 18:19 |
| betabug | and in the control panel you can see the state of things for that cache | 18:19 |
| elon | betabug: I'm planning on using ZODB standalone | 18:19 |
| betabug | then you won't have that control panel, but the same cache thing applies | 18:20 |
| betabug | and I guess there is an API somewhere to get to those numbers if you have to | 18:20 |
| elon | betabug: So... I can make and use large objects, without having memory issues? | 18:20 |
| betabug | haha, you can't generalize these things | 18:21 |
| betabug | usually people don't have memory issues, but if you do enough stupid things (unnecessarily loading objects) and if you have enough objects, things can slow down | 18:21 |
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| betabug | e.g. in Zope there are 2 methods to loop over the contents of a Folder: one enumerates the ids (strings) of the children, the other enumerates the objects | 18:23 |
| elon | betabug: I understand that. Thanks for your help. | 18:23 |
| betabug | so you don't want to enumerate the objects if you don't need to, getting the strings is cheaper | 18:23 |
| betabug | np, you're welcome | 18:23 |
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